Photolytic (UVC) and photocatalyic (UVC/TiO2) decomposition of pyridines

Stapleton, David R.; Mantzavinos, Dionissios; Papadaki, Maria

doi:10.1016/j.jhazmat.2007.04.067

Cited by 27 publications

(15 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3, the apparent first order rate constants decreased with an increasing initial concentration of the pyridine, indicating non-elementary nature of the sonochemical reactions. This dependence of reaction rate constants on initial concentration compared well with existing literature (Zechmeister and Magoon 1956;Stapleton et al 2006Stapleton et al , 2007.…”

Section: Effect Of Initial Pyridine Concentrationsupporting

confidence: 83%

“…This suggests that increasing the initial concentration of the solution would decrease the removal rates of pyridine. This is because the increment of initial concentration of the volatiles results in the weakening effect of cavitation reactions (Stapleton et al 2007). However, the total amount of pyridine degraded after 60 min at 100 mg/L was as much as three times larger than that degraded at 10 mg/L.…”

Section: Effect Of Initial Pyridine Concentrationmentioning

confidence: 99%

See 1 more Smart Citation

Ultrasonic removal of pyridine from wastewater: optimization of the operating conditions

Elsayed

2014

Appl Water Sci

View full text Add to dashboard Cite

In this study, a fundamental research had been carried out to explore the removal of pyridine in wastewater by ultrasound radiation. The effects of initial pyridine concentration, radiation time, pH, aeration, and the reaction temperature on the pyridine removal efficiency were investigated. The removal rates of pyridine at 180 min sonication time were found to decrease from 53 to 15 % with increasing the initial concentration from 10 to 100 mg/L. However, the total amount of pyridine degraded after 60 min at 100 mg/L was as much as three times larger than that degraded at 10 mg/L. The optimal pH was found to be 9 which resulted in 25 % pyridine removal after 180 min ultrasound radiation. By observing the change of pH value with the sonication time up to 60 min, it was observed that, pH of the sonicated pyridine aqueous mixture has decreased from 9.2 to 6.2 during the irradiation. The decrease in the pH may be attributed due to the formation of peroxy radicals in the solution and subsequently formation of oxygen free radicals. The simultaneous aeration could improve pyridine removal efficiency of ultrasound irradiation by 24 %. With increasing media temperatures, the removal efficiencies of pyridine increased in the temperature range in this study. In the end, it could be proposed that ultrasound radiation was an effective method for the removal of pyridine from wastewater.

show abstract

Section: Effect Of Initial Pyridine Concentrationsupporting

confidence: 83%

Section: Effect Of Initial Pyridine Concentrationmentioning

confidence: 99%

Ultrasonic removal of pyridine from wastewater: optimization of the operating conditions

Elsayed

2014

Appl Water Sci

View full text Add to dashboard Cite

show abstract

“…Furthermore, the simultaneous opening of the pyridine ring and release of chloride may be an explanation why no intermediates are formed in which chlorine would be replaced by e.g. hydroxyl group, which could be expected according to the reports of some authors [4,[7][8][9]11,12,18,39]. These intermediates finally degraded to CO 2 , H 2 O, HCl, and NH 4 + .…”

Section: Kinetics and Mechanism Of Photodegradationmentioning

confidence: 76%

“…Because of their frequent use, chemical stability and resistance to biodegradation, there is a strong need for finding efficient methods for their removal and transforming to the products that are not harmful to the environment. Since heterogeneous photocatalysis with titanium dioxide as semiconductor appeared as one of the most efficient methods for eliminating a number of pesticides from water [2][3][4][5], study of the efficiency of the photocatalytic degradation of pyridine derivatives has recently attracted significant attention of researchers [4,[6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Photodegradation of clopyralid in TiO2 suspensions: Identification of intermediates and reaction pathways

Šojić

Anderluh

Orčić

et al. 2009

Journal of Hazardous Materials

View full text Add to dashboard Cite

“…In our previous work [23,24] it was reported that 2-CPY, which was found to be genotoxic at 100 g ml −1 , is readily removed upon photolytic treatment at 254 nm. 2-CPY rate of removal was found to increase with increasing temperature, and on lowering solution volume or initial 2-CPY concentration.…”

Section: Introductionmentioning

confidence: 99%